solar heat exchanger we passed CE,GMC,ISO certification high efficient,stable performance, it is widely used solar heat exchangerWorking ... pump makes heat-conductiong liquid circulate automatically.Then the heat-conducting liquid transfers heat to water by heat exchanger in the tank to heat the ... 15m-20m each, diameter 12mm,thickness 1mm. 5.Heat pipe:Ati-freeze:-35C6.Capacity:100L,150L,200L,250L ...